Seasonal variation of the soil seed bank of grasses in central Argentina as related to grazing and shrub cover

Mayor, M.D.; Bóo, Roberto M.; Peláez, D.V.; Elı́a, Omar R.

doi:10.1006/jare.2002.1060

Cited by 40 publications

(35 citation statements)

References 23 publications

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“…Dispersion of seeds because of the wind is larger from the mother plant for light than heavy seeds (Chambers & MacMahon, 1994). Also, Mayor et al (2003) reported that P. vaginatum was present in the soil seed bank at depths no greater than 4 cm from the soil surface in the Phytogeographical Province of the Espinal, a relatively close area to our study site. Sunlight scarcely penetrates the soil surface (Caldwell et al, 2007), and anthecia of P. vaginatum does not penetrate deep into the soil (Mayor et al, 2003).…”

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“…Also, Mayor et al (2003) reported that P. vaginatum was present in the soil seed bank at depths no greater than 4 cm from the soil surface in the Phytogeographical Province of the Espinal, a relatively close area to our study site. Sunlight scarcely penetrates the soil surface (Caldwell et al, 2007), and anthecia of P. vaginatum does not penetrate deep into the soil (Mayor et al, 2003). Because of this, that sunlight might be enough to stimulate (1) seed germination of P. vaginatum given appropriate conditions for the germination of this species (e.g., adequate soil both moisture and nutrient contents), and (2) the germination responses of P. vaginatum to light (i.e., Table 3).…”

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Light effects on seed germination of two spontaneous populations of Pappophorum vaginatum

et al. 2017

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Our objectives were to (1) determine the effects of light on seed germination of 2 populations (P1, P2) of Pappophorum vaginatum, and (2) compare the germination responses between these populations. Because of this, two studies were conducted. The first study evaluated the effects of 2 light conditions (L0=darkness, and L1=14 h light) on the cumulative germination (%) after 4, 8, 15 and 19 days from imbibition. The second study was conducted only under L1 conditions, and it evaluated the (a) cumulative germination, (b) germination speed index, (c) time to 50% of cumulative germination (T50), (d) percentage of empty spikelets (i.e., without cariopsis), and percentage spikelets with imbibed, but not germinated cariopsis after 19 days from imbibition of seeds. Pappophorum vaginatum was the dominant species in both study communities, but total, live plant cover was 37.5% in community 1, and 62.5% in community 2. Both populations were sensitive to light. After 19 days from imbibition there was a significant, positive effect of light on cumulative germination. In the second study, cumulative germination and germination speed index were greater (p≤0.01) in P1 than in P2. At the same time, T50 and the percentage of spikelets with imbibed, but not germinated cariopsis, were greater (p≤0.01) in P2 than in P1; no differences were found in the percentage of empty spikelets. Our results demonstrated that light was important for seed germination in P. vaginatum, and that the timing for initiating germination as a response to light differed between the two study P. vaginatum populations.KEY wORDS: germination, Pappophorum vaginatum, populations, light effects, natural reseeding, establishment, perennial grasses RESUMENNuestros objetivos fueron (1) determinar el efecto de la luz en la germinación de dos poblaciones (P1, P2) de Pappophorum vaginatum, y (2) comparar las respuestas de la germinación entre estas poblaciones. Se condujeron dos estudios. El primer estudio evaluó los efectos de dos condiciones de luz (L0=oscuridad, y L1=14 h de luz) en la germinación acumulada (%) después de 4, 8, 15 y 19 días desde la imbibición. El segundo estudio solo se condujo bajo las condiciones L1, y se evaluaron (a) la germinación acumulada, (b) el índice de velocidad de germinación, (c) el tiempo al 50% de germinación acumulada (T50), (d) el porcentaje de espiguillas vacías (sin cariopse), y el porcentaje de espiguillas con ca-

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Light effects on seed germination of two spontaneous populations of Pappophorum vaginatum

et al. 2017

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“…For example, it was reported that the soil seed bank was sufficient to restore degraded vegetation in the Hunshandak Sandlands in northern China due to enough seeds in the soil [17], while in northeastern Hungary it was not viable to restore degraded vegetation with only the natural soil seed bank due to the lack of native species [18]. It has been proven that many factors could affect the seed density and species composition, such as seed size and shape [19], historical vegetation [20], microhabitat variation [21], human disturbance [22], season variation [23], and climate changes [24]. Many studies have been conducted in recent years that attempt to understand the effects of human disturbance on the soil seed bank [25,26].…”

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confidence: 99%

Responses of Soil Seed Bank and Vegetation to the Increasing Intensity of Human Disturbance in a Semi-Arid Region of Northern China

Xiao

Wang

et al. 2017

Sustainability

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Abstract:To provide more insights into the responses of the soil seed bank and vegetation to human disturbance intensity, we selected four land use types, including: native grassland (no human disturbance), abandoned artificial grassland (light human disturbance), artificial grassland (moderate human disturbance), and farmland (severe human disturbance) in a semi-arid climate of northern China. The species composition and density of the soil seed bank were measured, as well as the species composition and amount of vegetation. The native grassland had a significantly higher soil seed density and species richness than the other land use types. Moreover, the common species both in the soil seed bank and vegetation between the native grassland and other land use types gradually decreased as disturbance intensity increased. The abandoned artificial grassland and artificial grassland still had abundant soil seed banks according to their seed density (≥28.2% of the native grassland) and species richness (≥70.0% of the native grassland) to restore the vegetation. Conversely, it was hard to restore the vegetation on the farmland due to its low soil seed density (10.0% of the native grassland) and species richness (40.0% of the native grassland). In conclusion, human disturbance would generate significant negative effects on the soil seed bank in desertified regions in a semi-arid climate; however, the soil seed bank in land use types with light/moderate disturbance are more adapted to vegetation restoration compared with land use types with severe disturbance in a semi-arid region.

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“…Ungrazed sites typically possess a greater number of species and higher species density in the seed bank compared to grazed sites (O'Cannor and Pickett, 1992;Jutila, 1998;Mayor et al, 2003). Navie et al (1996) , CaCO 3 =2.37%, organic matter= 1.37%, available phosphorus and potassium 14.09, 167.14 mg kg -1 respectively.…”

Section: Introductionmentioning

confidence: 99%

Soil Seed Bank and Aboveground Vegetation in Grazing Lands of Southern Marmara, Turkey

Parlak

Gökkuş

Demiray

2011

Not Bot Hort Agrobot Cluj

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The composition and conservation of plant communities is greatly influenced by the soil seed bank. Information on the soil seed banks and the remaining vegetation in these ecosystems is crucial for guiding the restoration efforts. This study examines the size, species richness, diversity, uniformity, and similarity of soil seed banks and aboveground vegetation in 6 different grazing lands including coastal pasture, reseeded pasture, artificial pasture, lowland shrubland, ungrazed pasture, and hillside shrubland. Forty-eight soil samples were taken by cores with a diameter and depth of 10 cm from each of grazing lands in August of 2007. A vegetation survey was conducted using a 0.5 x 0.5-m quadrant in both the spring and fall. Eighty species were observed in soil seed banks and aboveground vegetation. . The most common species in seed banks were annual and perennial grasses in reseeded pasture, annual forbs in artificial pasture and hillside shrubland, and perennial forbs in low shrubland and ungrazed pasture. Species richness, diversity, and uniformity in seed banks were highest in lowland shrubland and lowest in artificial pasture. The seed bank and aboveground vegetation were similar in ungrazed pasture, coastal pasture, reseeded pasture, low shrubland, hillside shrubland and artificial pasture. Shrublands play an important role in species richness and the number of germinated seeds from seed banks of grazing lands in southern Marmara. The results showed that reseeding or a decrease in grazing pressure may improve the condition of grazing lands.

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Seasonal variation of the soil seed bank of grasses in central Argentina as related to grazing and shrub cover

Cited by 40 publications

References 23 publications

Light effects on seed germination of two spontaneous populations of Pappophorum vaginatum

Light effects on seed germination of two spontaneous populations of Pappophorum vaginatum

Responses of Soil Seed Bank and Vegetation to the Increasing Intensity of Human Disturbance in a Semi-Arid Region of Northern China

Soil Seed Bank and Aboveground Vegetation in Grazing Lands of Southern Marmara, Turkey

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